Christian Weiske & Jurgen Ernst

ThunderBird add-on implements RFC 2369 in displaying mailing list headers. It helps to view mailing lists in ThunderBird by providing easy access to information such as list name, owner, and email addresses in a structured manner.

ThunderBird add-on displays country icons for servers along with the mail route for easy access.

The header scroll extension for Thunderbird is an addon that improves the extended header view by adding a scrollbar to it. This allows users to view and access headers more easily without having to navigate through lengthy emails.

This Thunderbird add-on enhances Expanded Header View by placing an image on its right side.

SeaMonkey add-on shows user agent icon for received mails.